There are many things that cause this CTD, not just a change of runway.  If you change an altitude crossing restriction...bam, CTD, if you change a speed restriction...bam CTD, if you change???...bam CTD.

Everytime I need a make any change whatsoever, it is like an ax hanging over my head that could drop at any moment.

I am sorry, but this is not what I think is fun nor what I fly for...aircraft is now in the hanger until this and a lot of other things are fixed.  Part of this problem may have to do with it being a port over from FS9, hence the need for FSUIPC.  I think that until they come out with a true FSX version, we are going to have these kind of problems.

If CS thinks this only effects a few people and therefore is not worth looking at, then so be it..it is their product and their reputation.